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Finding the Fourth Proportional to 39,805.70, 54,930.48 and 21,900.52

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Solution

The fourth proportional to 39,805.70, 54,930.48 and 21,900.52 is: 30,221.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,805.70 : 54,930.48 = 21,900.52 : x
  2. Step 2: Convert to fraction form
    39,805.70/54,930.48 = 21,900.52/x
  3. Step 3: Cross multiply
    39,805.70x = 54,930.48 × 21,900.52
  4. Step 4: Simplify right side
    39,805.70x = 1,203,006,075.85
  5. Step 5: Solve for x
    x = 1,203,006,075.85/39,805.70
  6. Step 6: Final answer
    x = 30,221.96

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.